After successfully saving Ryume and stopping AgÅ, Ryuga and Rian are assigned under her as guardians of Line City, investigating a mysterious increase in Horror activity in the area. This is all a plot by Makai Knight Zinga and his wife Makai Priestess Amily who have since become Horrors to raise the ancient weapon Radan to destroy humanity in revenge for the death of their son years earlier. To stop them, Ryuga and Rian team up with Daigo Akizuki, Giga the Beast Knight, and the Makai Priests Gald and Haruna, as well as D Ringo and Yukihime before the two Horrors can succeed in their plans.